7 day survivor is not even hard... I got it and I am not a hardcore 1337 gamer.
It is just time consuming. You just need the magazines and to gather food. Then you just wait it out and gather more food. Not to mention some people told me that you can pause your game/360 so it is not even continuous (not that it is that difficult to get continuously though).
The reason not many people have it is because Dead Rising's cluster **** of a campaign where you have to get the best ending to unlock the 72 hour mode.
Not many gamers bothered to get the A-rank and just went for zombie killing fun. Added to that is after unlocking 72 mode, many did not want to go through that chore.
The megaman blaster is far better than the lazer sword (which is cool albeit a little bit disappointing) in terms of utility and fun imo.
So basically it is not even a hard achievement to get.
Lost Planet 2....the one for getting everything xD There is also one in FF XIII wich if i remember properly, requires you to have had every item possible in the game. Also one for opening every single treasure sphere? Geez
GT: RineN1. State you are from here before adding! Waiting for: BioShock: Infinite(360) Playing: RE 6(360) Dead Space 3(360) Watching: Another
Lost Planet 2....the one for getting everything xD
That's the one old school linked too.
And I have to give a huge middle finger to any developer or publisher that thinks that an achievement that involves being number 1 on a global leaderboard, that they never reset, is even acceptable, let alone a good idea.
R.I.P. Eve English (Feb. 12, 1968 - Oct. 13, 2010) Momma Eve, you will be missed.